Three-fourths of the homework ______today.a.have finished b.

Three-fourths of the homework ______today.a.have finished b. three fourths of the homework have finished three fourths of the homework have finished 怎么理解 用have finis Three fourths of the homework ( )toda Three fourths of the homework has been done today 为什么不用have? three-fourths of the building( )A.was destroyed B.is deatroy Three fourths of the land____ with trees.A.are covered B.is a.Three fourths of the teachers present _____ against three-fourths of the work ___today A has finishe The students ____their homework already.A.have finished.B.ha Three-fourths of the buildings was destroyed. three-fourths of the surface of the earth ( ) sea